The correct sentence in formal prose:
Formal prose is a form of writing that does not make use of contractions, and other informal language and writing styles that are not recognized in the formal sphere. It also has an objective tone.
In the sentence above, the writer observed the rules of grammar by including the period and hyphen where necessary. The writer did not use slang or any other kind of informal language that a native speaker of the English language will not be able to understand. In addition, the statement was devoid of any personal feelings.
There was nothing that pointed to a subjective tone in the sentence. Instead, the speaker stated the fact. When writing formal prose, the points noted above should be considered. So option A accurately describes the formal prose.
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